Capsule or container for gases or liquids under pressure



, R. H. CAMPBELL. CAPSULE 0R CONTAINER FOR GASES ORLIQUIDS UND ERPRESSURE APPLICATION FILED OCT 23, I9I9. 1,387,451.

Patented Aug. 16, 1921.

2 SHEETS-SHEET I- n .r ai

. I a z.

H. CAMPBELL. CAPSULE OR CONTAINER FOR GASES 0R LIQUIDS UNDER PRESSURE.

' APPLICATION FILED act 23, 1919 1,387,451

2 SHEEfS-SHEET 2.

fiflalm l 217/ .By 4%? M114 Amway 1 UNITED STATES PATENT OFFICE.

ROBERT HUNTER CAMPBELL, OF "UIPER EDMONTON, ENG-LAND.

CAPSULE OR CONTAINER FOR GASES OR LIQUIDS UNDER PRESSURE.

To all whom-it may concern:

Be itv known that I, ROB RT HUNTER CAMPBELL, a subject of the King ofGreat Britain and Ireland, residing at Angel Road, Upper Edmonton, inthe county. of Middlesex, En land, have invented certain new and usefulmprovements Relating to Ca sules or Containers for Gases or Liquidsnder- Pressure, of which the following'is a specification. i

This invention relates to capsules or containers for gases or liquidsunder pressure, and is especially directed to improvements in the typeof closure device described in BritishPatent No. 9652 of 1910, in whicha soft metal plug is utilized to retain in position a hard metal closingelement,

The objects of the invention are to. simplify the construction, and tofacilitate the re-use of the capsules or containers.

The lnvention conslsts broadly in forming an internal thread in the neckof the capsule or container, above the shoulder or the like againstwhich sealing is effected, and in retaining the closing element by aplastic element flowed into this thread.

The invention further consists in employing in conjunction with theabove'a buckled disk of hard metal as the closing element.

The invention also consists in forming notches or other engaging.devices in the plastic metal,

- In carrying the invention into effect inthe form shown by way ofexample in Figs. 1 and 2, as a plied to containers for carbonic acid gason er pressure, we utilize capsules.

made preferably in accordance with British application No. 19573 of 1918having'thickened necks.

closing disk d is adapted to seat, a'packing ring 0 being preferablyiprovided, to facilitate the effective sealing o the capsule.

The cylindrical wall of the recess is provided with a screw thread 1, sothat the neck" pressing up the soft metal at the same time advancing thepreferably simultaneously with the flowing of the plastic metal into thethread, these notches or the like screw-driver, and having being.

nished with a plastic element Z The neck a is provided with a recess 6'having a shoulder-0 upon which the Specification of Letters Patent.Patented A .16, 1921 Application filed October 23, 1919. Serial No.332,822.

is internally screwed. A ring 9 of plastic metal which fits looselyinside the screwthreadedportion f of the recess 6 is placed intoposition on the top' of the closing disk d, which is preferably of hardmetal, and is buckled, so that it does not seat upon the shoulder or thering washer 6 provided thereon, until some considerable pressure hasbeen applied to it. The plastie'metal ring g is held in place by asuitable plunger h, preferably with a projecting pin a which passes.into the hole formed through it, and before pressure is applied, thegas can be' filled into the capsule by the usual means. When the capsulehas been filled to the pressure required, the plunger h is advanced,ring, and expandmg it laterally into the threads'formed in the wall ofthe recess, the projecting pin i closing disk Into a sealing position onthe capsule neck. The plunger i can if necessary be provided w1th fourprojecting feathers which form longitudinal grooves in the internalsurface of they ring 9 as the plungeris advanced. The capsule isavailable for use of its "contents by perforation of the closing disk inthe usual way. 1 VVhe'n it is desired to re-use the capsule, it is onlyrequired to hold thecapsule in a suitable applianceto prevent itturning, and to apply to it a spindle corresponding to a a male endadapted to engage with the grooves formed in the plastic metal ring.When this is advanced against the ring,and rotated in the direc-- tion.to unscrew that ring, the whole closing device-is readily removed, andthe capsule'is ready for re-use.- Instead of employing the buckled diskabove described, we may use a dished metal cup having its edge serratedor corrugated. or provided with projections as described in BritishPatent No. 9652 of,1910.

In Figs. 3 and 4 is shown a capsule provided with a dished metal cup jhaving its will perforated with four holes k and furhavin'g grooves m tofacilitate filling. 106

It will be noticed that these grooves m are provided at both ends of theelement Z the objectbeing to render it impossible for the latter to beplaced incorrectly in position I in the neck of the capsule. i 1 10"Beneath the dished cup, 7' is placed a washer n which upon applicat onof pressure to the cup is pressed firmly upon the seating and provides agood joint between the latter and the flange of the cup In 3 thedifferent parts are shown in the position occupied during filling of thecapsule and Fig.4 shows the corresponding positions on completion ofthis operation.

For reuse of the capsule similar means may be employed for the removalof the plastic element 1 as are described above with reference to Figs.1 and 2.

We may also employ either ebonite fiber or metal sealing washers, withsuch cupped closing disks, or with the buckled type disk aboveindicated.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is:-

1. A capsule or container for gases or liquids under pressure includingan internally threaded neck, a seating, sealing means co-acting withsaid seating and a plasticelement expanded into said internally threadedneck to retain said sealing means on said seating.

2. A capsule or container for gases or liquids under pressure includinga neck, a

seating and a screw thread in said neck, a packing ring, a plasticelement expanded into said screw thread to retain said packing ring uponsaid seating and a metallic member between the plastic element and saidpacking ring.

3. A capsule or container for gases or liquids under pressure includinga neck, a seating and a screw thread in said neck, packing means, aplastic element in said neck, and a buckled plate between the plastic.element and said packing means.

4:. A capsule or container for gases or liquids under pressure includinga neck, a seating and a screw thread in said neck, packing means, aplastic element in said neck, and'a metallic cup-shaped member betweenthe'plasti'c element and said packing means. I

5. A method of retaining sealing means upon a seating in a capsule orcontainer which includes expanding a separate plastic element into athreaded neck of the capsule by applying'pressure to the plasticelement.

In testimony whereof I have signed my name to this specification.

ROBERT HUNTER CAMPBELL.

